Three-dimensional spin susceptibility in Ba${}_{0.75}$K${}_{0.25}$Fe${}_2$As${}_2$: Out-of-plane modulation revealed by neutron spectroscopy and theoretical modeling

Naoki Murai, Katsuhiro Suzuki, Masamichi Nakajima +4

We present a combined experimental and theoretical investigation of the spin dynamics in the iron-based superconductor Ba${}_{0.75}$K${}_{0.25}$Fe${}_2$As${}_2$. Time-of-flight inelastic n…